CN110835908A

CN110835908A - Soft soil curing composite foundation treatment technology for assembled thin-wall light steel structure

Info

Publication number: CN110835908A
Application number: CN201810931897.8A
Authority: CN
Inventors: 徐成; 柏文峰; 王云
Original assignee: Yunnan Huakun Assembly Building Co Ltd
Current assignee: YUNNAN ZHONGQIAN INTEGRATED HOUSE Co.,Ltd.
Priority date: 2018-08-16
Filing date: 2018-08-16
Publication date: 2020-02-25

Abstract

The invention relates to a soft soil curing composite foundation treatment technology for an assembled thin-wall light steel structure, and belongs to the technical field of constructional engineering. The technical problems to be solved are that the basic bearing layer of the assembled thin-wall light steel structure cannot reach the design value, the assembled thin-wall light steel structure has large sedimentation amount and uneven sedimentation, and the like, and the safety problems are solved.

Description

Soft soil curing composite foundation treatment technology for assembled thin-wall light steel structure

Technical Field

The invention relates to a soft soil curing composite foundation treatment technology for an assembled thin-wall light steel structure, and belongs to the technical field of constructional engineering.

Background

Because of the characteristics of light dead weight, small load of a structural foundation and the like, the foundation design mostly adopts a natural shallow foundation, and mainly adopts a raft foundation and a strip foundation under a wall. However, the natural shallow foundation is greatly affected by the soil bearing layer, and more foundation bearing layers are only filled with miscellaneous soil or soft silt soil, and have no foundation bearing capacity or very low bearing capacity, and in this case, the foundation safety and the settlement stability of the superstructure have great problems.

Disclosure of Invention

The invention aims to solve the technical problems that the basic bearing layer of the assembled thin-wall light steel structure cannot reach the design value, the assembled thin-wall light steel structure has larger sedimentation amount and uneven sedimentation, and the like, and provides a composite foundation technical treatment scheme under the condition of a soft foundation soil layer, solves the problem that the existing assembled thin-wall light steel structure cannot adopt a natural foundation in a soft foundation, and provides a new solution for structural safety and construction convenience.

The technical scheme of the invention is as follows:

Step 1: taking original soil from a project site to perform a soil test, determining physical parameters of the soil, and configuring a special soil curing agent;

step 2: performing foundation excavation according to a drawing, performing overbreak to a depth of about 500mm below the foundation bottom, and removing original soil impurities;

and step 3: the super-excavation part under the foundation adopts double-layer cushions with the thickness of 250mm to carry out layered curing, the upper cushion layer and the lower cushion layer adopt cement, curing agent, quicklime and original soil to carry out curing and layered rolling, the rolling weight is about 20 tons, the predicted compression strength of the cushion layers reaches 1.0Mpa, and the foundation bearing capacity in-situ test is carried out;

and 4, step 4: pouring a plain concrete cushion layer on the super-excavated solidified soil layer;

and 5: placing reinforcing steel bars, setting templates and pouring concrete of the strip foundation or the raft foundation according to a foundation design drawing;

step 6: after the concrete foundation reaches the design strength, mounting an upper assembly type thin-wall light steel structure;

further optimization: the depth of the solidified soil layer can be adjusted according to the soil property condition on site;

further optimization: if the soft layer soil body is deeper, the lower part of the solidified soil layer can be squeezed and compacted by adopting throwing and squeezing rubbles;

further optimization: the whole foundation range needs to be spread for operation to solidify the soil layer, and a soil body raft is formed;

further optimization: the surface of the solidified soil layer does not need to be provided with a broken stone cushion layer, and plain concrete can be directly poured.

The invention has the beneficial effects that:

1) and the integrity is enhanced. The solidified soil reinforcement technology is adopted, namely a soil body raft plate with higher compressive strength is arranged under a concrete foundation, so that the stability of a soil layer under the foundation is enhanced, and the uneven settlement can be well controlled;

2) and the basic bearing capacity is improved. By the original soil curing technology, the bearing capacity of the foundation is improved from about Kpa level to Mpa level, and the design bearing capacity of the foundation is greatly improved;

3) and the economy is good. By adopting the soft soil curing and rechecking foundation treatment technology of the assembled thin-wall light steel structure, the section size of the concrete foundation can be greatly reduced, the earthwork excavation amount is small, the earthwork backfilling speed is high, the occupied area of the building foundation is obviously reduced, the energy and the land are saved, and the manufacturing cost is reduced;

4) the technology enriches the foundation form of the assembly type thin-wall light steel structure, so that the composite foundation can meet the requirement of rapid construction of the assembly type building.

Drawings

FIG. 1 is a schematic cross-sectional view of a composite foundation of the present invention;

in the figure: 1-undisturbed original soil; 2-bottom layer solidified soil cushion layer; 3-upper layer solidified soil cushion layer; 4-plain concrete cushion; 5-reinforced concrete raft plate foundation; 6-light steel keel composite wall.

Detailed Description

The invention will be further described with reference to the following drawings and detailed description:

step 1: taking original soil 1 from a project site to perform a soil test, determining physical parameters of the soil, and configuring a special soil curing agent;

step 2: performing foundation excavation according to a drawing, performing overbreak to a depth of about 500mm below the foundation bottom, and removing original soil impurities 1;

and step 3: the super-excavation part under the substrate is subjected to layered curing by adopting double-layer cushions with the thickness of 250mm respectively, and a lower layer cured soil layer 2 is cured and rolled by adopting cement, a curing agent, quicklime and original soil 1; then, solidifying and rolling the upper solidified soil layer 3 by adopting cement, a curing agent, quicklime and the original soil 1, wherein the rolling weight is about 20 tons, the predicted compression strength of the cushion layer reaches 1.0Mpa, and carrying out foundation bearing capacity in-situ test;

and 4, step 4: pouring a plain concrete cushion layer 4 on the super-excavated solidified soil layer;

and 5: placing the steel bars, arranging the templates and pouring concrete of the reinforced concrete raft foundation 5 according to a foundation design drawing;

step 6: and after the concrete foundation 5 reaches the design strength, installing the upper assembled thin-wall light steel structure wall 6.

Claims

1. The utility model provides an assembled thin wall light steel construction weak soil solidification composite foundation treatment technology which characterized in that: the foundation bearing capacity of the soft soil is greatly improved to a megapascal level by utilizing an original soil solidification technology, the problems of low bearing capacity, uneven settlement, high foundation cost and the like of most natural shallow foundation soil bodies are solved, the production construction efficiency is improved, and the earth outsourcing and construction period are reduced.

2. The processing technology of the assembled thin-wall light steel structure soft soil curing composite foundation according to claim 1, characterized in that: original soil of the place where the project is located is utilized to carry out in-situ solidification, and the bearing capacity of the foundation is greatly improved.

3. The processing technology of the assembled thin-wall light steel structure soft soil curing composite foundation according to claim 1, characterized in that: the solidified soil layer is processed by double-layer layered rolling.

4. The processing technology of the assembled thin-wall light steel structure soft soil curing composite foundation according to claim 1, characterized in that: the double-layer solidified soil layer forms the integral rechecked solidified soil plate body character, and the stability of the foundation soil is enhanced.

5. The processing technology of the assembled thin-wall light steel structure soft soil curing composite foundation according to claim 1, characterized in that: besides the fabricated thin-wall light steel structure, the light wood structure, the bamboo structure and the light concrete structure can also adopt the construction method to improve the construction speed and reduce the construction cost.